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<title>Problem 2331. -- [SCOI2011]地板 -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>2331: [SCOI2011]地板</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>128 MB<br><span class=green>Submit: </span>138&nbsp;&nbsp;<span class=green>Solved: </span>59<br>[<a href='submitpage.php?id=2331'>Submit</a>][<a href='problemstatus.php?id=2331'>Status</a>][<a href='bbs.php?id=2331'>Discuss</a>]</center><h2>Description</h2><div class=content><p class="p0" style="margin-top: 0pt; margin-bottom: 0pt"><span style="font-weight: bold; font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; text-indent: 21pt"><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'">lxhgww<font face="宋体">的小名叫</font><font face="Times New Roman">&ldquo;</font><font face="宋体">小</font><font face="Times New Roman">L&rdquo;</font><font face="宋体">，这是因为他总是很喜欢</font><font face="Times New Roman">L</font><font face="宋体">型的东西。小</font><font face="Times New Roman">L</font><font face="宋体">家的客厅是一个</font></span><span><img height="20" alt="" width="42" src="file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ksohtml/wps_clip_image-25795.png" /></span><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'">的矩形，现在他想用<font face="Times New Roman">L</font><font face="宋体">型的地板来铺满整个客厅，客厅里有些位置有柱子，不能铺地板。现在小</font><font face="Times New Roman">L</font><font face="宋体">想知道，用</font><font face="Times New Roman">L</font><font face="宋体">型的地板铺满整个客厅有多少种不同的方案？</font></span><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; text-indent: 21pt"><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'">需要注意的是，如下图所示，<font face="Times New Roman">L</font><font face="宋体">型地板的两端长度可以任意变化，但不能长度为</font><font face="Times New Roman">0</font><font face="宋体">。铺设完成后，客厅里面所有没有柱子的地方都必须铺上地板，但同一个地方不能被铺多次。</font></span><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; text-align: center"><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'"><o:p><img alt="" src="/JudgeOnline/upload/201106/22.jpg" /></o:p></span></p></div><h2>Input</h2><div class=content><p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; text-indent: 21pt"><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'">输入的第一行包含两个整数，<font face="Times New Roman">R</font><font face="宋体">和</font><font face="Times New Roman">C</font><font face="宋体">，表示客厅的大小。</font></span><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; text-indent: 21pt"><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'">接着是<font face="Times New Roman">R</font><font face="宋体">行，每行</font><font face="Times New Roman">C</font><font face="宋体">个字符。</font><font face="Times New Roman">&rsquo;_&rsquo;</font><font face="宋体">表示对应的位置是空的，必须铺地板；</font><font face="Times New Roman">&rsquo;*&rsquo;</font><font face="宋体">表示对应的位置有柱子，不能铺地板。</font></span><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><h2>Output</h2><div class=content><p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; text-indent: 21pt"><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'">输出一行，包含一个整数，表示铺满整个客厅的方案数。由于这个数可能很大，只需输出它除以<font face="Times New Roman">20110520</font><font face="宋体">的余数。</font></span><span style="font-size: 10.5pt; font-family: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p></div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>2 2<br />
<br />
*_<br />
<br />
__<br />
<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>1<br />
<br />
</span></div><h2>HINT</h2>
			<div class=content><p><p>R*C&lt;=100</p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Day1'>Day1</a></p></div><center>[<a href='submitpage.php?id=2331'>Submit</a>][<a href='problemstatus.php?id=2331'>Status</a>][<a href='bbs.php?id=2331'>Discuss</a>]</center>﻿<br>

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